Display Instagram feed using the Smash Balloon

To display the Instagram feed on the site footer download this plugin Smash Balloon.
You will get the file instagram-feed.zip.
Go to the WordPress Dashboard >> Plugins >> and click Add New

Once the plugin is installed, on the next window click Activate Plugin.
Now you have a CPT name Instagram Feed in your WordPress menu.

To know about the process how to create and customize the feed click here.
Once you have created your feed, copy the shortcode and add it to the Footer layout.

For this Edit the Footer layout and add the shortcode into the code module labeled Instagram Feed (as shown in the below screenshot).